Experimental Study On Seismic Behavior Of Precast Shear Wall With Energy Dissipation Devices

At present,with the progress of industrialization of building structure,fabricated structure is one of the development directions of modern architecture.The connection mode and seismic performance are the inportant factors to be considered in the structural design.For the traditional febricated shear wall structure system,the construction technology of precast wall and cast-in-place joints is often used.However,the hoisting technology is so complex and difficulty that the connection and seismic performance is not reliable.Therefore,the author proposes to install double X-shaped metallic dampers at the vertical joints,which are used as connectors for precast shear wall and help the structure to dissipate seismic energy.Two groips of 1/2 scale specimens of reinforced concrete shear walls with different shear span ratios are designed and manufactured.Each group of specimens includes normal cast-in-place shear wall,new type of precast shear wall with double X-shaped metallic darrpers and contrast precast shear wall without damper.Through quasi-static test,the seismic performance of this precast shear wall with metallic danpers and the influence of shear span ratio are studied.The main research contents are as follows:(1)Damage situation:Conpared with precast shear wall without daryper shear wall,the damage area of precast shear wall with metallic dampers is more uniform,almost covering the whole specimen wall.Double X-shaped metallic danper works after the wall yields.(2)Energy dissipation performance:In the whole working stage of the precast shear wall with metallic dampers,the double X-shaped metallic damper increased the energy d:issipation,which effectively improves the shape of the hysteretic curve.(3)Strength and stiffness:double X-shaped metallic damper can connect the precast wall effectively.In the whole working stage of the specimen wall,the strength and stififiess of the precast shear wall with the metallic darnpers are higher than that of the precast shear wall without danper.(4)The larger the deformation of the double X-shaped metallic damper,the more obvious its energy dissipation effect is.Dampers in prefabricated walls with large shear span are more conducive to energy consumption.However,if the shear-span ratio of prefabricated walls is too large,column-shaped walls may be formed,and the energy dissipation perfo rmance of the walls themselves will be weakened.Therefore,attention should be paid to avoid the formation of column wall limbs in the design of assembled shear walls.